参数资料
型号: MC68HC05SR3B
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDIP42
封装: SDIP-42
文件页数: 37/96页
文件大小: 612K
代理商: MC68HC05SR3B
MOTOROLA
5-6
MC68HC05SR3
RESETS AND INTERRUPTS
5
Figure 5-3 External Interrupt
+
&
EXTERNAL
REQUEST
INTERRUPT
POWER-ON RESET
EXTERNAL RESET
EXTERNAL INTERRUPT
BEING SERVICED (IRQ ONLY)
D
C
R
Q
VDD
INTO BIT
I-BIT (CCR)
IRQ
tILIH
tILIL
EDGE SENSITIVE TRIGGER
CONDITION
The minimum pulse width tILIH is either
125ns (VDD=5V) or 250ns (VDD=3V).
The period tILIL should not be less than
the number of tcyc cycles it takes to ex-
ecute the interrupt service routine plus
21 tCYC cycles.
tILIH
Wired ORed
Interrupt signals
IRQ
if after servicing an interrupt the
external interrupt pin (IRQ) remains
low,
then
the
next
interrupt
is
recognized. Normally used with pull-up
resistors for wired-OR connection.
(b) Interrupt Mode Diagram
(a) Interrupt Function Diagram
LEVEL SENSITIVE TRIGGER
CONDITION
+
&
IRQ
100K
VDD
TPG
40
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